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Cannot save ArrayList Uri in file: NotSerializableException

I have to save an ArrayList from Ury, so I use code

public static void saveUriList(ArrayList<Uri> myUriList) { if (storageAvailable()) { try { FileOutputStream uriListSaved = new FileOutputStream( baseDir + File.separator + filename); ObjectOutputStream uriList = new ObjectOutputStream( uriListSaved); uriList.writeObject(myUriList); uriList.close(); } catch (Exception exc) { exc.printStackTrace(); } } }

This code structure is great for a custom object that implements serializable, but with Uri objects returns this exception

 10-18 21:06:40.169: W/System.err(11957): java.io.WriteAbortedException: Read an exception; java.io.NotSerializableException: android.net.Uri$StringUri 10-18 21:06:40.169: W/System.err(11957): at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:933) 10-18 21:06:40.169: W/System.err(11957): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2262) 10-18 21:06:40.169: W/System.err(11957): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2217) 10-18 21:06:40.169: W/System.err(11957): at java.util.ArrayList.readObject(ArrayList.java:665) 10-18 21:06:40.169: W/System.err(11957): at java.lang.reflect.Method.invokeNative(Native Method) 10-18 21:06:40.169: W/System.err(11957): at java.lang.reflect.Method.invoke(Method.java:507) 10-18 21:06:40.169: W/System.err(11957): at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1520) 10-18 21:06:40.169: W/System.err(11957): at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1443) 10-18 21:06:40.169: W/System.err(11957): at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:2112) 10-18 21:06:40.169: W/System.err(11957): at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:916) 10-18 21:06:40.169: W/System.err(11957): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2262) 10-18 21:06:40.169: W/System.err(11957): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2217) 10-18 21:06:40.169: W/System.err(11957): at it.myApp.testApp.utility.FileArchiveManager.loadUriList(FileArchiveManager.java:158) 10-18 21:06:40.169: W/System.err(11957): at it.myApp.testApp.MyClass.onCreate(MyClass.java:107) 10-18 21:06:40.169: W/System.err(11957): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 10-18 21:06:40.169: W/System.err(11957): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615) 10-18 21:06:40.169: W/System.err(11957): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667) 10-18 21:06:40.169: W/System.err(11957): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 10-18 21:06:40.169: W/System.err(11957): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935) 10-18 21:06:40.169: W/System.err(11957): at android.os.Handler.dispatchMessage(Handler.java:99) 10-18 21:06:40.169: W/System.err(11957): at android.os.Looper.loop(Looper.java:130) 10-18 21:06:40.169: W/System.err(11957): at android.app.ActivityThread.main(ActivityThread.java:3687) 10-18 21:06:40.179: W/System.err(11957): at java.lang.reflect.Method.invokeNative(Native Method) 10-18 21:06:40.179: W/System.err(11957): at java.lang.reflect.Method.invoke(Method.java:507) 10-18 21:06:40.179: W/System.err(11957): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) 10-18 21:06:40.179: W/System.err(11957): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) 10-18 21:06:40.179: W/System.err(11957): at dalvik.system.NativeStart.main(Native Method) 10-18 21:06:40.179: W/System.err(11957): Caused by: java.io.NotSerializableException: android.net.Uri$StringUri 10-18 21:06:40.179: W/System.err(11957): at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1535) 10-18 21:06:40.179: W/System.err(11957): at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1847) 10-18 21:06:40.179: W/System.err(11957): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1689) 10-18 21:06:40.179: W/System.err(11957): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1653) 10-18 21:06:40.179: W/System.err(11957): at java.util.ArrayList.writeObject(ArrayList.java:651) 10-18 21:06:40.179: W/System.err(11957): at java.lang.reflect.Method.invokeNative(Native Method) 10-18 21:06:40.179: W/System.err(11957): at java.lang.reflect.Method.invoke(Method.java:507) 10-18 21:06:40.179: W/System.err(11957): at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1219) 10-18 21:06:40.179: W/System.err(11957): at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1575) 10-18 21:06:40.179: W/System.err(11957): at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1847) 10-18 21:06:40.179: W/System.err(11957): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1689) 10-18 21:06:40.179: W/System.err(11957): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1653) 10-18 21:06:40.179: W/System.err(11957): at it.myApp.testApp.utility.FileArchiveManager.salvaListaPathImmagini(FileArchiveManager.java:127) 10-18 21:06:40.179: W/System.err(11957): at it.myApp.testApp.LoadImage.onActivityResult(LoadImage.java:120) 10-18 21:06:40.179: W/System.err(11957): at android.app.Activity.dispatchActivityResult(Activity.java:3908) 10-18 21:06:40.179: W/System.err(11957): at android.app.ActivityThread.deliverResults(ActivityThread.java:2532) 10-18 21:06:40.179: W/System.err(11957): at android.app.ActivityThread.handleSendResult(ActivityThread.java:2578) 10-18 21:06:40.179: W/System.err(11957): at android.app.ActivityThread.access$2000(ActivityThread.java:117) 10-18 21:06:40.179: W/System.err(11957): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:965) 10-18 21:06:40.189: W/System.err(11957): ... 8 more

I believe this is because Uri does not implement Serializable ....

How can I fix this problem? Should I create a custom Uri object?

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2 answers

As you already noticed, Uri does not implement Serializable, see the link android.net.Uri . How to save your uris as strings when writing a file and convert them back to uris using Uri.parse() when reading a file?

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when saving

 String str = myUri.toString();

and at boot

 Uri myUri = Uri.parse(str);
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Source: https://habr.com/ru/post/1440635/

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